ISO 2992:1974
Ammonium sulphate for industrial use; Determination of iron content; 2,2'- Bipyridyl photometric method

Standard No.

ISO 2992:1974

Release Date

1974

Published By

International Organization for Standardization (ISO)

Latest

ISO 2992:1974

Scope

Applicable to Fe contents of equal to or more than 0.0001 % (m/m). The reaction bases on the reduction of iron(III) by hydroxylammonium chloride. Formation of the complex between iron(II) and 2,2'-dipyridyl in a buffered medium (pH value between 4.5 and 6). Photometric measurement of the coloured complex at a wavelength of about 522 nm. Has also been approved by the IUPAC.

ISO 2992:1974 history

• 1974 ISO 2992:1974 Ammonium sulphate for industrial use; Determination of iron content; 2,2'- Bipyridyl photometric method